Signal lamp



FIG. 1 is top perspective view of the signal lamp showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a side perspective view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a rear view thereof.

CLAIM The ornamental design for a signal lamp, as shown and described.